public async Task <IActionResult> SetMainPhoto(int userId, int id)
        {
            if (userId != int.Parse(User.FindFirst(ClaimTypes.NameIdentifier).Value))
            {
                return(Unauthorized());
            }
            var userFromRepo = await _repo.GetUser(userId);

            if (!userFromRepo.Photos.Any(p => p.Id == id))
            {
                return(Unauthorized());
            }
            var photoFromRepo = await _repo.GetPhoto(id);

            if (photoFromRepo.IsMain)
            {
                return(BadRequest("This is already the main photo!"));
            }
            var currentMainPhoto = await _repo.GetMainPhoto(userId);

            currentMainPhoto.IsMain = false;
            photoFromRepo.IsMain    = true;
            if (await _repo.SaveAll())
            {
                return(NoContent());
            }
            return(BadRequest("Could not set main photo"));
        }